// SPDX-License-Identifier: GPL-2.0 /* WMI driver for Xiaomi Laptops */ #include <linux/acpi.h> #include <linux/device.h> #include <linux/input.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/wmi.h> #include <uapi/linux/input-event-codes.h> #define XIAOMI_KEY_FN_ESC_0 "A2095CCE-0491-44E7-BA27-F8ED8F88AA86" #define XIAOMI_KEY_FN_ESC_1 "7BBE8E39-B486-473D-BA13-66F75C5805CD" #define XIAOMI_KEY_FN_FN "409B028D-F06B-4C7C-8BBB-EE133A6BD87E" #define XIAOMI_KEY_CAPSLOCK "83FE7607-053A-4644-822A-21532C621FC7" #define XIAOMI_KEY_FN_F7 "76E9027C-95D0-4180-8692-DA6747DD1C2D" #define XIAOMI_DEVICE(guid, key) \ .guid_string = (guid), \ .context = &(const unsigned int){key} struct xiaomi_wmi { struct input_dev *input_dev; struct mutex key_lock; /* Protects the key event sequence */ unsigned int key_code; }; static void xiaomi_mutex_destroy(void *data) { struct mutex *lock = data; mutex_destroy(lock); } static int xiaomi_wmi_probe(struct wmi_device *wdev, const void *context) { struct xiaomi_wmi *data; int ret; if (!context) return -EINVAL; data = devm_kzalloc(&wdev->dev, sizeof(struct xiaomi_wmi), GFP_KERNEL); if (data == NULL) return -ENOMEM; dev_set_drvdata(&wdev->dev, data); mutex_init(&data->key_lock); ret = devm_add_action_or_reset(&wdev->dev, xiaomi_mutex_destroy, &data->key_lock); if (ret < 0) return ret; data->input_dev = devm_input_allocate_device(&wdev->dev); if (data->input_dev == NULL) return -ENOMEM; data->input_dev->name = "Xiaomi WMI keys"; data->input_dev->phys = "wmi/input0"; data->key_code = *((const unsigned int *)context); set_bit(EV_KEY, data->input_dev->evbit); set_bit(data->key_code, data->input_dev->keybit); return input_register_device(data->input_dev); } static void xiaomi_wmi_notify(struct wmi_device *wdev, union acpi_object *dummy) { struct xiaomi_wmi *data = dev_get_drvdata(&wdev->dev); mutex_lock(&data->key_lock); input_report_key(data->input_dev, data->key_code, 1); input_sync(data->input_dev); input_report_key(data->input_dev, data->key_code, 0); input_sync(data->input_dev); mutex_unlock(&data->key_lock); } static const struct wmi_device_id xiaomi_wmi_id_table[] = { // { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_0, KEY_FN_ESC) }, // { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_1, KEY_FN_ESC) }, { XIAOMI_DEVICE(XIAOMI_KEY_FN_FN, KEY_PROG1) }, // { XIAOMI_DEVICE(XIAOMI_KEY_CAPSLOCK, KEY_CAPSLOCK) }, { XIAOMI_DEVICE(XIAOMI_KEY_FN_F7, KEY_CUT) }, /* Terminating entry */ { } }; static struct wmi_driver xiaomi_wmi_driver = { .driver = { .name = "xiaomi-wmi", }, .id_table = xiaomi_wmi_id_table, .probe = xiaomi_wmi_probe, .notify = xiaomi_wmi_notify, .no_singleton = true, }; module_wmi_driver(xiaomi_wmi_driver); MODULE_DEVICE_TABLE(wmi, xiaomi_wmi_id_table); MODULE_AUTHOR("Mattias Jacobsson"); MODULE_DESCRIPTION("Xiaomi WMI driver"); MODULE_LICENSE("GPL v2");